单项选择题

You have to be patient if you want to sustain your position.

A. maintain
B. establish
C. acquire
D. support
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单项选择题
The index is the government's chief gauge of future economic activity.
A. measure
B. opinion
C. evaluation
D. decision
单项选择题
They agreed to modify their policy.
A. clarify
B. change
C. define
D. develop
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